Higuchi bound
WebThe value of mg is precisely the Spin-2 gauge line appearing on the Λ - m 2 g phase diagram for Spin-2, the partially massless gauge lines introduced by Deser & Waldron in the m 2 g, Λ) phase plane and described as the Higuchi bound m 2 g = 2 Λ /3. Note that this graviton is unitary with only four polarization degrees of freedom (helicities ... WebAug 9, 2012 · We extend the notion of the Higuchi bound and partial masslessness to ghost-free nonlinear bimetric theories. This can be achieved in a simple way by first considering linear massive spin-2 perturbations around maximally symmetric background solutions, for which the linear gauge symmetry at the Higuchi bound is easily identified.
Higuchi bound
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WebJul 4, 2024 · Interestingly, as a consequence of accelerated expansion, there exists a maximum spin for each Regge trajectory, which is helpful to make the spectrum consistent with the Higuchi bound, but at the same time, it could be an obstruction to stringy UV completion based on an infinite higher-spin tower.
WebHiguchi bound contain helicity modes with a negative norm, hence they are prohibited by unitarity. Immedi-Ms4 H2 Ms2 H2 s m 2 FIG. 1: Higuchi bound vs linear Regge trajectory: The shaded region is prohibited by the Higuchi bound (1). The linear Regge trajectory (the straight line) enters the prohib-ited region at a critical spin s c ’M2 s =H 2. WebSep 1, 2016 · The existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable …
WebThe existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable coupling with the inflaton... WebMar 12, 2024 · In this letter we show that the Higuchi bound can be circumvented in an alternative description of massive spin-2 particles known as $\mathcal {L} (a_1)$ models. In maximally symmetric spaces the...
WebJun 1, 1988 · In this brief note we consider the interaction between high spin excitations in string theory along the Regge trajectory and the Higuchi bound in de Sitter space. There is …
WebOct 9, 2024 · The existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable coupling with the inflaton foliation, since this breaks the de Sitter isometries. The action for these states can be constructed within the Effective Field Theory of Inflation, or ... small engine repair richmond hill gaWebSep 23, 2016 · The International School for Advanced Studies (SISSA) was founded in 1978 and was the first institution in Italy to promote post-graduate courses leading to a Doctor … small engine repair richfield mnWebThis inequality, called Higuchi bound [6], is a consequence of the (approximate) de Sitter symmetries during in ation. It implies that particles with spin decay outside the horizon faster than 1=a, where ais the scale factor. This implies that they leave a small e ect in the squeezed limit of correlation functions. small engine repair red wing mnWebOct 1, 2024 · In this setup, the minimal inflationary field content interacts with the massive spin-2 field through dRGT interactions, thus guaranteeing the absence of Boulware-Deser ghostly degrees of freedom. The unitarity requirement on spinning particles, known as Higuchi bound, plays a crucial role for the size of the observable signal. Authors: small engine repair reginaWebDec 10, 2024 · The Higuchi bound [3] is a bound on the mass of fields with spin two or higher in de Sitter space which captures the absence of ghosts. It states that a field of … small engine repair reference centerWebDec 7, 2024 · Interestingly, as a consequence of accelerated expansion, there exists a maximum spin for each Regge trajectory, which is helpful to make the spectrum … small engine repair rockville mdWebThe existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable coupling with the inflaton ... song for a wedding ceremony